<!DOCTYPE HTML>
<html>

<head>
    <title>three.proton - helloworld</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
    <style type="text/css">
    body {
        font-family: Monospace;
        background-color: #fff;
        margin: 0;
        padding: 0;
        overflow: hidden;
    }
    </style>
</head>

<body>
    <div id="container"></div>
    <script src="../lib/stats.min.js"></script>
    <script src="../lib/three.min.js"></script>
    <script src="../build/three.proton.min.js"></script>
    <script src="./js/lib/TrackballControls.js"></script>
    <script>
    var proton, emitter;
    var camera, scene, renderer, stats, clock, spring, controls;
    var color1, color2,
        tha = 0,
        hcolor = 0;

    init();
    function init() {
        addScene();
        addControls();
        addLights();
        addStars();
        addProton();
        //addInteraction();
        addStats();
        animate();
    }

    function addScene() {
        camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 1000);
        camera.position.z = 500;
        scene = new THREE.Scene();
        scene.fog = new THREE.Fog(0xffffff, 1, 10000);

        clock = new THREE.Clock();

        renderer = new THREE.WebGLRenderer();
        renderer.setPixelRatio(window.devicePixelRatio);
        renderer.setSize(window.innerWidth, window.innerHeight);

        document.body.appendChild(renderer.domElement);
        window.addEventListener('resize', onWindowResize, false);
    }

    function addControls() {
        controls = new THREE.TrackballControls(camera);
        controls.rotateSpeed = 1.0;
        controls.zoomSpeed = 1.2;
        controls.panSpeed = 0.8;
        controls.noZoom = false;
        controls.noPan = false;
        controls.staticMoving = true;
        controls.dynamicDampingFactor = 0.3;
    }

    function addLights() {
        var ambientLight = new THREE.AmbientLight(0x101010);
        scene.add(ambientLight);

        var pointLight = new THREE.PointLight(0xffffff, 2, 1000, 1);
        pointLight.position.set(0, 200, 200);
        scene.add(pointLight);
    }

    function addStats() {
        stats = new Stats();
        stats.showPanel(0);
        stats.dom.style.position = 'absolute';
        stats.dom.style.left = '0px';
        stats.dom.style.top = '0px';
        container.appendChild(stats.dom);
    }

    function addStars() {
        var geometry = new THREE.BufferGeometry();
        for (var i = 0; i < 10000; i++) {
            var vertex = new THREE.Vector3();
            vertex.x = THREE.Math.randFloatSpread(2000);
            vertex.y = THREE.Math.randFloatSpread(2000);
            vertex.z = THREE.Math.randFloatSpread(2000);
            geometry.vertices.push(vertex);
        }
        var particles = new THREE.Points(geometry, new THREE.PointsMaterial({
            color: 0x888888
        }));
        scene.add(particles);
    }

    function addProton() {
        proton = new Proton();

        emitter = new Proton.Emitter();
        //setRate
        emitter.rate = new Proton.Rate(new Proton.Span(4, 16), new Proton.Span(.01));
        //addInitialize
        emitter.addInitialize(new Proton.Position(new Proton.PointZone(0, 0, 0)));
        emitter.addInitialize(new Proton.Mass(1));
        emitter.addInitialize(new Proton.Radius(6, 12));
        emitter.addInitialize(new Proton.Life(3));
        emitter.addInitialize(new Proton.V(45, new Proton.Vector3D(0, 1, 0), 180));
        //addBehaviour
        emitter.addBehaviour(new Proton.Alpha(1, 0));
        emitter.addBehaviour(new Proton.Scale(.1, 1.3));

        color1 = new THREE.Color();
        color2 = new THREE.Color();
        colorBehaviour = new Proton.Color(color1, color2);
        emitter.addBehaviour(colorBehaviour);

        emitter.emit();
        //add emitter
        proton.addEmitter(emitter);
        proton.addRender(new Proton.SpriteRender(scene));
    }

    function createSprite() {
        var map = new THREE.TextureLoader().load("./img/dot.png");
        var material = new THREE.SpriteMaterial({
            map: map,
            color: 0xff0000,
            blending: THREE.AdditiveBlending,
            fog: true
        });
        return new THREE.Sprite(material);
    }

    function changeParticleColor() {
        hcolor += .01;
        color1.setHSL(hcolor - (hcolor >> 0), 1, .5);
        color2.setHSL(hcolor - (hcolor >> 0) + .3, 1, .5);
    }

    function animate() {
        stats.begin();
        requestAnimationFrame(animate);
        render();
        stats.end();
    }

    function render() {
        changeParticleColor();
        protonUpdate();
        renderer.render(scene, camera);
        camera.lookAt(scene.position);
        moveEmitter();
        rotateCamera(camera);
        
        Proton.Debug.renderInfo(proton, 3);
    }

    function protonUpdate(){
        var delta = clock.getDelta();
        delta < 5 / 60 && proton.update(delta);
    }

    function moveEmitter(){
        tha += Math.PI / 150;
        var p = 300 * Math.sin(2 * tha);
        emitter.p.x = p * Math.cos(tha);
        emitter.p.y = p * Math.sin(tha);
        emitter.p.z = p * Math.tan(tha) / 2;
    }

    var ctha = 0;
    var r = 500;
    function rotateCamera(camera){
        ctha += .016;
        r = 300;
        camera.position.x = Math.sin(ctha) * r;
        camera.position.z = Math.cos(ctha) * r;
        camera.position.y = Math.sin(ctha) * r;
    }

    function onWindowResize() {

    }
    </script>
</body>

</html>
